var split;
split = split || function (undef) {
    var nativeSplit = String.prototype.split,
        compliantExecNpcg = /()??/.exec("")[1] === undef,
        self;
    self = function (str, separator, limit) {
        if (Object.prototype.toString.call(separator) !== "[object RegExp]") {
            return nativeSplit.call(str, separator, limit);
        }
        var output = [],
            flags = (separator.ignoreCase ? "i" : "") +
                (separator.multiline ? "m" : "") +
                (separator.extended ? "x" : "") +
                (separator.sticky ? "y" : ""),
            lastLastIndex = 0,
            separator = new RegExp(separator.source, flags + "g"),
            separator2, match, lastIndex, lastLength;
        str += "";
        if (!compliantExecNpcg) {
            separator2 = new RegExp("^" + separator.source + "$(?!\\s)", flags);
        }
        limit = limit === undef ?
            -1 >>> 0 :
            limit >>> 0;
        while (match = separator.exec(str)) {
            lastIndex = match.index + match[0].length;
            if (lastIndex > lastLastIndex) {
                output.push(str.slice(lastLastIndex, match.index));
                if (!compliantExecNpcg && match.length > 1) {
                    match[0].replace(separator2, function () {
                        for (var i = 1; i < arguments.length - 2; i++) {
                            if (arguments[i] === undef) {
                                match[i] = undef;
                            }
                        }
                    });
                }
                if (match.length > 1 && match.index < str.length) {
                    Array.prototype.push.apply(output, match.slice(1));
                }
                lastLength = match[0].length;
                lastLastIndex = lastIndex;
                if (output.length >= limit) {
                    break;
                }
            }
            if (separator.lastIndex === match.index) {
                separator.lastIndex++;
            }
        }
        if (lastLastIndex === str.length) {
            if (lastLength || !separator.test("")) {
                output.push("");
            }
        } else {
            output.push(str.slice(lastLastIndex));
        }
        return output.length > limit ? output.slice(0, limit) : output;
    };
    String.prototype.split = function (separator, limit) {
        return self(this, separator, limit);
    };
    return self;
}();
if(!Array.prototype.indexOf){
    Array.prototype.indexOf = function(obj,start){
        for(var index=(start || 0), j = this.length; index < j;index ++ ){
            if(this[index]===obj){
                return index;
            }
        }
        return -1;
    }
}